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blood of Cerdic flowed in their veins.

 

    William I
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    F ATHER : Robert
    Known as ‘the Devil’ or ‘the Magnificent’, he was the son of Richard II, Duke of Normandy, by Judith of Brittany, and was born in c .1008 in Normandy. He perhaps married Astrid, daughter of King Sweyn, in c .1027, but repudiated her almost at once. He succeeded his brother Richard III as Duke of Normandy on 6 August, 1028, and died on 2 or 22 July, 1035, on pilgrimage at Nicea in Bithynia. William I was his illegitimate son.
    M OTHER : Herleva
    Alternatively called Arlette, she was the daughter of Fulbert, a tanner of Falaise in Normandy, by his wife Duxia. She was born in c. 1012. She is said to have been noticed by Duke Robert as she sat washing clothes in a river. Their liaison produced two children (below). Herleva married Herluin, Viscount of Conteville, between c .1029 and 1035, and had four (or perhaps as many as six) further children (below). She died in c. 1050, and was buried in the Abbey of St Grestain in France.
    S IBLINGS :
    Adeliza
    She was born perhaps in 1029, before her mother’s marriage to a Norman nobleman. She married firstly Enguerrand III, Count of Ponthieu ( d .1053), and had issue:
    1  Adelaide (alive in 1096).
    Adeliza married secondly Lambert of Boulogne, Count of Lens in Artois (who was killed in battle in 1054), in c. 1053, and had issue:
    2  Judith (1054/5–after 1086); she married Waltheof, Earl of Northumbria and Huntingdon (who was executed in 1076), and had issue, including Matilda, wife of David I, King of Scotland.
    Adeliza married thirdly Odo II, Count of Champagne (disinherited in 1071), and had issue:
    3  Stephen, Count of Aumale (before 1070–1121/30), who marriedHawise, daughter of Ralph de Mortimer of Wigmore, and had issue.
    Adeliza was styled Countess of Aumale in her own right from 1082. She died between 1087 and 1090.
    William did not have any full brothers.
    H ALF -S IBLINGS (the children of his mother’s marriage):
    1   Robert
    He was born in 1030/1, and was created Count of Mortain in c. 1049 or c. 1056. He was probably created Earl of Cornwall in c. 1066/7. He died on 8 December, 1090/1, and was buried in the Abbey of St Grestain, France.
    Robert married, before 1066:
    Matilda
    She was the daughter of Roger of Montgomery, Earl of Shrewsbury, by Mabel, daughter of William, Seigneur of Alençon-Bellême. The date of her death is not known; she was buried in the Abbey of St Grestain in France.
    Issue of marriage:
      (i)   William
    He was born before 1084. He succeeded his father as Count of Mortain on 8 December, 1090/1, and married a lady called Adelaide, of whom nothing more is known. He died after 1140.
     (ii)   Emma
    She married William IV, Count of Toulouse ( d. 1094), and had issue.
    Robert married secondly:
    Almodis
    She was perhaps a sister of Boson, Count of La Marche. After Robert’s death, she perhaps married Roger of Montgomery.
    2   Odo
    He was born between c .1031 and 1035. He entered the Church and was consecrated Bishop of Bayeux in Normandy around 1049 and before 23 April 1050. He was created Earl of Kent in 1066/7; he was deprived of this earldom, which was not forfeited, in 1082, but restored in 1087. He was again deprived of the earldom of Kent in 1088, and this time it was declared forfeit, Odo being banished from England. He died in February, 1097, at Palermo, Sicily, andwas buried in Palermo Cathedral.
    Odo had the following illegitimate issue :
    1  John.
    3   Emma (?)
    Historians now think she was probably fictitious. She is said to have married Richard of Goz, Viscount of Avranches ( d.c. 1082), and had issue:
    1  Hugh, Viscount of Avranches, Earl of Chester ( c .1047–1101), who married Ermentrude, daughter of Hugh, Count of Clermont, and had issue. Hugh died a monk.
    4   Muriel
    She married either William, Count of La Ferté-Macé, or, more probably, Eudo de Capello, Viscount of the Côtentin (it is possible that she had an unnamed sister